jz wan to give u guys sum reminders, don't ever leave aside small little tiny sub-topics in chap 9 and 10 (form 4) regarding alam sekitar and ekosistem. Last yr the two chaps gave a big big surprise to most of the candidates! (including me!) mayb u guys shud read up about mutasi as well, coz it didnt come out for paper 2 last yr!!

good luck!!